How to 3D scan graves designated as cultural properties: Five basics to know before implementation

When planning to 3D scan graves treated as cultural properties, many practitioners' initial confusion is not about equipment selection—i.e., which measurement method to use. In fact, whether you have organized the prerequisites—what you want to preserve, how much accuracy is required, how much work can be done on-site, and how the acquired data will be used afterwards—largely determines success or failure. Graves designated as cultural properties differ from ordinary structures or civil engineering objects; they present many factors that must be considered before measurement, such as material deterioration, surface weathering, wear of inscriptions, surrounding vegetation, narrow access paths, access restrictions, religious considerations, and constraints related to preservation and management.

Therefore, for 3D scanning of cultural heritage tombs, it is necessary to design with an eye not simply to whether they can be "three-dimensionally captured," but to where the results will be effective among preservation, recording, research, and public dissemination. Problems such as having scanned the site once but failed to capture the necessary surfaces, being unable to preserve inscriptions at a legible accuracy, coordinates being ambiguous and therefore unusable for re-surveys, or the data being too large to be shared among stakeholders—all stem from insufficient pre-survey design. For 3D scanning of cultural heritage tombs, designing how the record will be preserved is more important than the act of scanning itself.

This article clearly and concisely lays out, from an on-site perspective, the five basic points practitioners searching for "cultural property grave 3D scan" should understand before implementing 3D scanning of cultural-property graves. It also explains the general workflow and the approaches for making the deliverables usable.

Table of Contents

• Key considerations before 3D scanning cultural heritage tombs

• Basic 1: Decide in advance why you are doing the 3D scan

• Basic 2: Understand the condition of the target and the surrounding environment in advance

• Basic 3 Clarify the required accuracy and the form of deliverables

• Basic 4: Design on-site work around preservation considerations and the assurance of safety.

• Plan the Basic 5, including management and utilization after acquisition.

• General approach to 3D scanning cultural heritage tombs

• Summary

Key considerations before 3D-scanning graves designated as cultural properties

3D scanning of graves designated as cultural properties may seem similar to surveying ordinary monuments and stonework, but in practice it presents entirely different challenges. First, because the subject is a cultural property, simply preserving its shape is insufficient; it must be recorded in a way that does not damage the current condition and that can be used for future maintenance and academic research. In other words, three-dimensional data should not be merely a visual reproduction but a fundamental record for conservation, usable for comparison and verification.

The subject of a grave involves particular considerations. Not only the headstone itself, but also the base, surrounding stonework, memorial towers, ancillary stone materials, paving stones, the surrounding topography, and the relationship with the approach path can all be part of its value. Conversely, if the scope is expanded too far, work time and data volume increase, making it difficult to secure the precision required for the primary subject. Determining how much to treat as a single entity is therefore extremely important at the initial stage.

Also, cultural heritage graves are often subject to advanced weathering and loss due to having been outdoors for many years. They tend to present overlapping conditions that make measurement difficult—rough surfaces, moss and dirt adhering, fine inscriptions faded, cracks and unevenness, and strong contrasts of light and shadow in tree shade. On site, "you can capture it because you can see it" does not always hold true; it is common that "you can see it but it is hard to capture as data." For this reason, in 3D scanning of cultural heritage graves, rather than deciding the measurement method in advance, it is essential to organize the subject conditions and the intended uses and then choose the method.

What is even more important is that 3D scans of cultural heritage tombs do not end up as one-off records. They may later be used for a variety of purposes, such as comparing conditions before and after restoration, confirming the progression of deterioration, allowing researchers to reassess them from different perspectives, using them for exhibitions and education, or archiving them as local cultural resources. If you prioritize short-term operational efficiency at the initial stage, you may end up with data that are difficult to use later. Before implementation, it is important to consider not only what is needed now but also what the data might be used for several years from now.

Basic 1 Decide in advance why you are performing a 3D scan

The first basic step is to clarify the purpose of the 3D scan. Even if a request to create a 3D model of a cultural heritage tomb appears the same at first glance, the tasks required and the deliverables can vary greatly depending on the purpose. For example, the shooting methods and the way the data are produced differ depending on whether the goal is to record the current condition for conservation, to assist in reading inscriptions or decorations, to check for damage or tilting, or to create visualizations for public display.

If this planning remains vague and you proceed, the most likely mistake is photographing a wider area than necessary. Even if you produce a 3D reconstruction that includes the surroundings of the subject, it is not uncommon for the crucial carved inscriptions on the front of the gravestone to lack sufficient resolution and be unusable for detailed analysis. Conversely, concentrating only on the fine details can leave you unable to understand the graves’ spatial relationships or their relation to the terrain, making the results hard to use as preservation and management records. In short, when the purpose is unclear, you misjudge the balance between breadth and detail.

In practical work, it is not necessary to narrow the objective down to a single purpose, but you should always establish priorities. Simply deciding whether preservation documentation, survey and analysis, or public use is the top priority makes the required accuracy, measurement range, imaging density, and data management policy much clearer. Because it is often difficult to arrange another opportunity to re-measure graves that are cultural properties, it is important to decide in advance what must be recorded during the single on-site visit.

It is also essential to align stakeholders’ understanding of the objectives. If cultural property managers, surveyors, on-site supervisors, and record creators have different expectations of what 3D scanning should achieve, post‑work evaluations will not line up. One person may think “it’s enough if the shape is preserved,” while another may want to “use it to help decipher inscriptions.” Even if the measurement work itself has no problems, this gap in expectations can lead to the deliverables being judged unsatisfactory. Before introducing 3D scanning, it is very effective in practice to document and share what will be recorded, what it will be used for, and to what extent results are required.

Basic 2: Understand the condition of the subject and its surrounding environment in advance

The second basic principle is to carefully grasp the condition of the tomb itself as a cultural asset and its surrounding environment. 3D scanning is often thought of as a technology that can be adapted flexibly on site, but for cultural heritage the quality of the preliminary assessment directly determines the quality of the results. If on-site conditions are overlooked, not only will necessary surfaces fail to be captured, but preservation risks and safety issues may also arise.

First, the things you should check about the object’s condition are material, surface condition, complexity of shape, presence of damage or missing parts, depth of inscriptions or patterns, and whether there is any tilt or deformation. For example, stone that has been heavily weathered and has a grainy surface may have contours that are easy to capture but fine details that are difficult to read. Conversely, areas that retain a polished-like surface can fail to reveal features depending on how they are photographed. If moss or soil adheres thickly, even if it appears to have relief, the actual surface geometry and the shape of the adherent material can be mixed together, making judgment during post-processing difficult. Rather than lumping the subject together as simply an "old grave," understanding which faces show which condition differences will make it easier to set priorities on site.

Next, the surrounding environment. Tombs designated as cultural properties are often located within temple or shrine precincts, burial plots, mountainous areas, on slopes, atop stone steps, or in spaces surrounded by trees, which imposes restrictions on bringing in and moving equipment. Conditions such as unstable footing, confined surroundings, people coming and going, large variations in light, and slipperiness after rain greatly affect not only measurement efficiency but also safety management. In particular, when you want to capture the rear or top surfaces of a tomb, insufficient clearance around the site can prevent acquisition from the intended angles.

Also, for graves that are cultural properties, the handling of surrounding objects is important. Tree branches, fallen leaves, offerings, temporary structures, fences, explanatory plaques, and so on may be included in the data, but you need to decide in advance how far to include them. If you casually assume they can be removed later, the edges and ground-contact areas of the main subject can end up unnaturally missing. Conversely, if you forcefully avoid surrounding objects and thus lack necessary viewpoints, the data tends to become poorly connected. The photography plan will change depending on whether you include the surroundings to preserve the cultural-property context or prioritize the preservation record of the grave itself.

Furthermore, permits and attendance/supervision requirements are also part of the site environment. Graves that are cultural properties are often not objects that can be approached freely, and there may be rules governing access times, permissible work areas, prohibitions on touching, and whether protective measures are required. If advance checks are insufficient, on-site working time can be reduced, which can easily lead to inadequate data collection. Understanding the condition of the subject and the surrounding environment should be considered not merely a preliminary inspection but a planning task to reconcile ensuring accuracy with consideration for preservation.

Basic 3 Clarify the required accuracy and the form of deliverables

The third principle is to decide in advance what level of accuracy will be recorded and in which deliverables. In 3D scanning of cultural heritage tombs, it is often simply assumed that “the higher the resolution, the better,” but in practice a balance among accuracy, processing load, shareability, and usability is important. If you proceed without a clear idea of the required accuracy, you are likely to end up with deliverables that are large in data size but ambiguous in usefulness.

For example, if you want to preserve a record of a grave’s overall shape and layout, it is important that the entire subject is captured without gaps and that the positional relationships are organized in a form suitable for future comparison. On the other hand, if the goal is to assist reading inscriptions and fine carvings, it is important that the surface texture and minute reliefs are accurately represented. Furthermore, if you intend to use the data for repair planning or condition assessment, reproducibility that allows examination of dimensions and surface changes is required, not merely an aesthetically pleasing appearance. If what counts as "usable data" differs, the acquisition density required in the field and the approach to post-processing will also change.

The form of the deliverables is also important. Even for three-dimensional data, the preparations required differ greatly depending on whether you leave it as a point cloud, refine it into surface data, or produce easily reusable materials such as cross-sections or orthophotos. Some stakeholders place more importance on easily comparable still images or section drawings than on the 3D data itself. Conversely, if you are considering research or future use, it may be more valuable to preserve the data in a form close to the original. Before fieldwork, it is essential to clarify who will look at what and decide on deliverables that match those needs.

Also, the handling of positional information for cultural heritage graves must not be overlooked. If you consider not only the fine detailed shape of the grave itself but also the surrounding topography, its relationship with other stone monuments, and comparisons with future re-surveys, spatial consistency becomes important. Conversely, if the primary purpose is simple visualization for public presentation, advanced position management may not necessarily be the top priority. How much georeferencing to apply and to what extent positional reproduction should be targeted are factors that ought to be decided before implementation. If this is left vague, you may later encounter the problem of "having visual data but being unable to overlay it with other materials."

When considering accuracy, the important thing is not to pursue ideal values beyond what is necessary. Cultural heritage tombs often present strict on-site conditions, and aiming for uniformly high-resolution capture in every aspect tends to inflate both work time and data volume. In practice, it is more realistic to treat the recording of the tomb’s overall shape and the high-resolution capture of priority areas separately. Rather than processing overall recording and detailed capture at the same density, deciding which areas to prioritize makes it easier to improve the quality of deliverables even within limited time.

Basic 4: Design on-site work centered on preservation considerations and ensuring safety

The fourth basic principle is how on-site work is organized. At sites where cultural-property tombs are 3D scanned, preservation considerations and safety take priority over efficiency. Only after the basics are observed—do not touch the object, do not damage the surroundings, comply with on-site supervision conditions, prevent slips and falls, and avoid obstructing the movement of worshippers and other stakeholders—can measurement work proceed.

For cultural heritage targets, small actions—where workers stand, where equipment is placed, and how far cables and baggage are deployed—can have major significance. Around graves there are steps, cobblestones, slopes, and root‑riddled ground, so underfoot conditions are not uniform. Continuing measurements in awkward postures not only prevents stable data acquisition but also increases the risk of trips, falls, or contact. When designing fieldwork, it is necessary to consider not only how to capture the subject but also how people will move.

From a conservation perspective, it is a fundamental rule not to clean the surface of the object carelessly, not to apply alignment marks directly to it, and not to move surrounding items without permission. For graves that are cultural properties, deposits or nearby objects that appear visually obtrusive may nevertheless have significance for preservation or management. Do not touch them solely to make measurement easier; proceed only after agreeing with the site manager on how much preparatory work is acceptable. Altering the object for the sake of 3D digitization would be counterproductive.

Also, because the graves of cultural properties are located outdoors, they are strongly affected by weather and time of day. Strong direct sunlight, dappled light through trees, low-angle evening light, and wet surfaces after rain all influence how surfaces appear and the stability of data acquisition. In practice, when deciding the date and time to enter the site, it is important to anticipate lighting conditions and footing/access conditions that will make work easier. To ensure that the necessary areas are reliably captured within a limited time, it is effective to reduce on-site decision-making by deciding routes and priority surfaces to capture in advance.

Furthermore, on-site work for cultural heritage tombs requires checks made on the assumption that retakes will be difficult. You must perform at least a minimal check on site to ensure there are no oversights or missing parts, because if deficiencies are discovered after returning to the office you may not be able to revisit. In particular, areas that are likely to cause problems if found lacking later—such as the front (inscription) face, joints on the sides, the top surface, the back, and the contact area with the foundation—should be prioritized for on-the-spot inspection. On-site work should be organized to prioritize reliably capturing the necessary information rather than photographing as many things as possible in a short time.

Basic 5 Plan to include management and utilization after acquisition

The fifth basic principle is to develop an implementation plan that includes how to manage and how to utilize the acquired 3D data. In 3D scanning of cultural heritage tombs, on-site data capture tends to attract attention, but what really makes a difference is how the data are handled after acquisition. Even if you go to the trouble of creating 3D models, if the files are too large to open, naming conventions are not standardized, they are not linked with related photos and notes, or it’s unclear who has the latest version, their value as both archival records and research materials is diminished.

Data for graves of cultural properties is not something collected once and then finished; it may be used over time for comparisons made years later, cross-checking before and after repairs, integration with other materials, registration in local archives, and so on. For that reason, it is important to manage the site name, location, acquisition date, capture extent, working conditions, person in charge, related photographs, and supplementary notes together with the three-dimensional data rather than separately. This is because there is often a surprising amount of information that cannot be determined from three-dimensional data alone when it is reviewed later.

In terms of usability, it is more practical not to place too much emphasis on the 3D data itself. Many field personnel and managers do not always check data in a 3D viewer. Only when the data is organized into purpose-specific formats—easy-to-compare still images, simple explanatory materials, diagrams that indicate locations of deterioration, and lightweight data that are easy to share—does actual utilization progress. In 3D scanning of cultural heritage graves, preparing the output into a usable form is as important as creating it.

From a preservation-management standpoint, it is necessary to organize information so that it can withstand future re-measurement. If records do not remain of when, which area, under what conditions, and based on what standards the data were acquired, the reliability of time-series comparisons will decline. Because cultural properties are items to be protected over the long term, data management should not be closed out as a single-year deliverable, but should be treated as the foundation for continued monitoring. Adopting this mindset before implementation makes it easier to design recording procedures at the on-site acquisition stage without omissions.

Furthermore, the design of what to share is something that is easily overlooked in practice. Data concerning graves that are cultural properties is not necessarily meant to be widely published in full. For research, management, and general public release purposes, it may be necessary to differentiate how data is presented and handled. For that reason, during post-acquisition data curation it is important to decide what to retain as the master/original and what to extract as a shared version. Having a plan that looks ahead to post-acquisition also clarifies priorities for on-site work and leads to 3D scanning that is more efficient and less wasteful.

General procedure for 3D scanning graves of cultural properties

We have explained five basic points so far, but practitioners will likely be interested in the actual workflow. The general approach to 3D scanning graves that are designated as cultural properties is easier to organize if you consider the following sequence: confirming the target, clarifying objectives, checking on-site conditions, developing an acquisition plan, performing on-site work, organizing the data, creating deliverables, and storage and management.

The first thing to do is to clarify the value and scope of the subject. Decide whether you are targeting the gravestone alone, whether to include the base or surrounding stone features, or whether to cover its relationship with the surrounding terrain and approach path. At this stage, confirming the managers’ and stakeholders’ understanding of the objectives will help prevent rework later.

Next, check the target’s surface condition and the surrounding environment to determine which surfaces are important, where there are areas that are difficult to capture, and where access is possible.

Based on that, decide what deliverables to produce and to what degree of accuracy. It is important to consider how to combine three-dimensional records for overall understanding with detail-focused capture of inscriptions, decorations, and similar features. During on-site work, prioritize acquiring the important faces of the primary subject, and consciously supplement surfaces that tend to become blind spots and ground-contact areas. Throughout the work, strictly observe preservation considerations and proceed in a way that does not place a burden on the subject or the surrounding environment.

After acquisition, it is important not only to remove unnecessary parts but also to compile metadata such as the target name and acquisition conditions together. Organize the deliverables in a format that stakeholders can easily use, and, where appropriate, separate them into materials for overall understanding and for detailed review so they are easier to handle in practice. Finally, with future re-surveys and comparative use in mind, arrange the data storage location, naming conventions, and links to related documents so the records retain value beyond a single use.

When 3D scanning cultural heritage tombs, special equipment and complex processing alone do not determine success. Rather, steady preparations—understanding the subject, setting objectives, taking on-site conditions into account, and designing the deliverables—affect the outcome. If you grasp this workflow at the outset, you can greatly reduce the risk of failure even on a first project.

Summary

When considering how to 3D-scan cultural heritage tombs, the first thing to grasp is not the names of equipment or methods but the design mindset: what to record, what extent, at what accuracy, and how to preserve it. Cultural heritage tombs are subjects that require more cautious judgment than general three-dimensional measurement due to weathering and loss, confined site conditions, preservation constraints, and religious considerations. Therefore, mastering five basics—clarifying objectives, understanding the subject and its surrounding environment, specifying required accuracy and deliverables, designing on-site work with preservation considerations as a premise, and planning post-acquisition management and utilization—becomes the quickest path to successful implementation.

Especially in practice, care must be taken that producing three-dimensional data does not become an end in itself. 3D scans of cultural heritage tombs are meaningful only insofar as they support subsequent activities such as preservation, investigation, comparison, and sharing. No matter how carefully they are acquired, if spatial relationships are ambiguous, if they are not linked to on-site records, or if they cannot be compared upon revisiting, their range of use will be limited. Anticipating how they will be used in the future at the pre-implementation stage leads to valuable three-dimensional records.

In the survey and documentation of graves that are cultural properties, it is essential not only to capture three-dimensional shapes but also to verify on-site positions and understand the surrounding context. Even when the precise shape of a grave is recorded using 3D measurement, verifying control points, grasping the positional relationships of surrounding features, and organizing coordinate-tagged records on site greatly improve the accuracy and reusability of subsequent workflows. In such situations, combining a high-precision positioning device like an LRTK that can be attached to an iPhone makes it easier to streamline the organization of on-site location information and the recording process. If you want efforts to preserve cultural property graves by 3D scanning to go beyond shape capture and proceed integrally to include on-site coordinate verification and surrounding records, adopting a simple surveying approach that leverages LRTK can help build a more practical and reusable documentation system.